Screw-cutting tool.



Patented May 6, |902.

J. J. BURKE.

SCREW CUTTING TL.

Appl nnmeaoz a1 1901) Y (No Model.)

STATES -ATnNT OFFICE.

SCREW-CUTTING TOOL.

SPECIFIICATION forming part of Letters Patent N o. 699,446, dated May 6, 1902.

Application lcd October 31, 1901. Serial No. 80,647. (No model.)

T0 all whom t indy concern:

Be it known that I, JAMES J. BURKE, a citizen of the United States, and a resident of Hartford, in the county of Hartford and State of Connecticut, have invented certain newY and useful Improvements in Screw-Cutting Tools, of which the following is a full, clear, and exact description.

My invention relates to screw-cutting tools, and more particularly to that class of said tools employed for threading pipe, although it is not limited to such use.

VIt is frequently a desideratum to employ dies tor threading pipes or rods of different sizes, and heretofore a single pair of dies has been mounted with capability of adjustment in the stock, requiringfrequent changes of the dies and sometimes considerable delay in obtaining the proper set. Furthermore, in the old class of die-stocks known to me no provision has been madel for guides of various sizes to suit the diameter of the work being threaded, and as each die-stock has been equipped with but one guide the consequence has been that a single stock cannot be employed forY advantageous use with dierent sizes of work.

In view of what has been stated, one objectvof my invention is the provision of a diestock havin ga series of dies so mounted therein that one set of dies may be employed for threading work of one diameter, another set for work of a different diameter, and still other sets for other diameters of Work, so that one stock may be utilized for accomplishing the results now requiring the employment of a series of these devices.

Afurther object of the invention is the provision in a die-stock of sets of superimposed dies, some of which may be of one pitch'and others of a different pitch, so that threads of the desired inclination may be formed upon work of different diameters with one and the same stock.

A further object of the invention is the provision in a die-stock of sets ofv telescopicV guides or bushings for itting the desired diameter of work, as will be hereinafter eX- plained.

In the accompanying drawings, Figure l is a plan view of the rear side of a diestock containing my improvements. Fig. 2

is a side elevation, partially in section, of the same. Fig. 3 is a plan view ot' the working end of the die-stock, showing one of the bolts for clamping the dies in place in section; and Fig. 4 is a detail View showing the dies.

Referring to the drawings, the numeral 5 designates a die-stock, which may be of any approved pattern, but is preferably formed as an integral casting, havingthe usual side arms or handle-bars G 6', handles 7 7', and workguide 8. This die-stock is provided with side plates or Walls 9 9' and with extensions lO 10', tapped to receive screws 12 l2', as illustrated in Fig..2. Vtithin the chamber between the plates 9 9' are superimposed dies 13 13', each being provided with a slot 14 for the reception of bolts 15 15', which pass through the slots in the dies and are at one end preferably threaded into the stock, as shown at 16 in Fig. 2, although other means for attaching said bolts may be substituted, if desired.

Threaded into the extensions l0 l0 of the die-stock are the screws 12 12', as above stated, and, as will be obvious, by loosening the bolts 15 l5 and turning said screws, which bear against the rear ends of the dies, said dies may be adj usted to suit the diameter of work to be threaded. In practice one pair of dies will preferably be so adjusted that it will be ready to receive a certain standard diameter of work,another pair a different diameter,and so on. In other words, certain standard sizes of pipe or rod are generally required in repair or other work, and the size selected can be inserted between the pairs of dies of larger size without interference `until it reaches the proper set, and thedies below that set can then be adjusted either by hand or otherwise out of the"way and the bolts 15 15' tightened to clamp all the dies in position. In this way with but a single stock a tool is provided within which any ordinary diameter of pipe or rod may be quickly threaded without the necessity of searching for particular dies to t the work and then removing the pair of dies in use and replacing them by those selected. Furthermore, by employing certain of the pairs of dies with one pitch of thread and other pairs with a reverse pitch both right and left threads may be cut with the same stock without removing the dies and replacing them by others.

Designated generally by the numeral 17 is a set of telescopic bushings, each of'which may be provided with openings 18, having threaded Walls for the reception of screws 19, passing through the Work-guide 8. These screws are of sufficient length to secure in position any desired member ofthe set of bushings employed.

As will be seen by reference to Figs. 1 and 2, a set of bushings composed of three members nesting or telescoping together is shown, each of said bushings being of different diameter from any ofthe others and from the integral Work-guide 8. These bushings are designated, respectively, by the numerals 20, 21, and 22, and when a size or diameter of Work different from vthat for which the guide 8 is adapted is required the desired bushingfor instance, that designated by 20-Will be inserted Within said Work-guide and secured in position by the screws 19, and if adift'erent size of bushing is required, as indicated by 2l, said bushing will be inserted within the bushing 2O and also secured by the screws 19. In this Way a Work-guide may be built up to iit the diameter of pipe or rod to be threaded, thereby adapting a single stock for a wide range of Work. In practice a set of these telescopic bushings or auxiliary Work-guides will accompany and be sold with the die-stock, and each bushing will be marked to accord with the diameter of work it is adapted to receive.

iTo enable the progress of the work to be observed, sight-openings 23 23' are formed in the plates 9 9, and these openings also serve as convenient places for the insertion of tools for pushing back the dies against the adjusting-screws 12 l2.

For stiening the die-stock corrugations or ribs 24 may be formed thereon, as shown in Figs. 2 and 3, and in practice the extensions 10 10 may be united with the plates 9 9 or otherwise braced in position, if desired. A

While a set of telescoping bushings composed of three members is shown, it is distinctly to be understood that the invention is not limited in this respect, for sets containing any desired number of bushings may be substituted for that shown, if deemed necessary or convenient.

Changes may be made in the means for adjusting and clamping the dies and in the form and dimensions of the stock without departure from the invention, which is not limited to the exact details shown and described, and the dies may be placed in other stocks or holders adapted to be employed with screw-cntting machines, if desired.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A screw-cutting implement comprising sets of independent dies arranged in column, each die being constructed to thread a difterent gage of Work, and means for adjusting said dies, so that the die it is desired to employ may be utilized for threading the Work for which it is intended while the other dies are-withdrawn and do not interfere with the passage of said work.

2. A screw-cutting implement comprising sets of independent, sectional dies arranged in column, the dies being of different sizes and each die being adapted to thread work independent of the Work threaded by any other die; means for adjusting said dies; and means for guiding the work to the die in use.

3. In a screw-cutting tool, the combination, with a chambered die-stock, of pairs of superimposed dies, each of a size for threading a different diameter of work, mounted in the chamber of said stock; means for clamping the dies in position; a work-guide; and telescopic bushings adapted to be fitted within said Work-guide.

4. In a screw-cutting tool, the combination, with a chambered die-stock of slotted dies arranged in superimposed pairs Within the chamber of said stock, each pair of dies being of a size different from the other pairs of dies; bolts passing through the slots of the dies; and means for individually adjusting the dies.

5. In ascreW-cutting tool, the combination, with a die-stock of pairs of dies fitted for adjustment on said stock, each pair being of different gage from any other pair; means for clamping the dies together in column; means vof dies arranged in column between said plates, each die being of a size adapted to thread a cert-ain gage of work dierent from the gage threaded by any other die; means for clamping the dies in place; and means for adjusting the dies.

8. In a screw-cutting tool, the combination, with a die-stock having stiftened side plates and a Work-guide, of pairs of dies, each pair being of different gage from any other pair arranged in column at each end of the chamber between said plates; bolts passing through slots in the dies and threaded at one end into the stock; and screws for individually adjusting the dies.

9. In a screw-cutting tool, the combination, with a die-stock having sight-openings, of pairs of. dies of dierent gages mounted in a chamber of said stock, the dies being arranged in column; and means for adjustably securing said dies in position.

10. ln a screw-cutting tool, the combination, with a die-stock having a chamber, of dies of a construction adapted to thread different classes of Work, arranged in column IOO within said chamber; extensions adjacent to telescopio bushings fitted Within the guide; the ends of said chamber; screws threaded superimposed pairs of dies, eaeh pair being 1o through the extensions and bearing against of a size to it a different gage of work from the dies; and means for clamping the dies in any other pair.

place. 1 JAMES J. BURKE.

11. In a screw-cutting tool, havinga work- Witnesses: guide, the combination, with said guide, of FRANCES E. BLODGETT,

screws passing through the walls of the guide 5 WILLIAM H. BLODGETT, Jr. 

